add blank time support; docs improved

docs/QuickStart.md

@@ -440,16 +440,23 @@ has, err := engine.Get(user)
 
 1) 传入Slice用于返回数据
 ```Go
-var everyone []Userinfo
+everyone := make([]Userinfo, 0)
 err := engine.Find(&everyone)
+
+pEveryOne := make([]*Userinfo, 0)
+err := engine.Find(&pEveryOne)
 ```
+
 2) 传入Map用户返回数据，map必须为`map[int64]Userinfo`的形式，map的key为id
 ```Go
 users := make(map[int64]Userinfo)
 err := engine.Find(&users)
+
+pUsers := make(map[int64]*Userinfo)
+err := engine.Find(&pUsers)
 ```
 
-3) 也可以加入条件
+3) 也可以加入各种条件
 ```Go
 users := make([]Userinfo, 0)
 err := engine.Where("age > ? or name=?)", 30, "xlw").Limit(20, 10).Find(&users)

session.go

@@ -1522,7 +1522,7 @@ func (session *Session) bytes2Value(col *Column, fieldValue *reflect.Value, data
 	//Now only support Time type
 	case reflect.Struct:
 		if fieldValue.Type().String() == "time.Time" {
-			sdata := string(data)
+			sdata := strings.TrimSpace(string(data))
 			var x time.Time
 			var err error
 			// time stamp
@@ -1543,6 +1543,9 @@ func (session *Session) bytes2Value(col *Column, fieldValue *reflect.Value, data
 				}
 				st := fmt.Sprintf("2006-01-02 %v", sdata)
 				x, err = time.Parse("2006-01-02 15:04:05", st)
+			} else if sdata == "0000-00-00 00:00:00" {
+				var t time.Time
+				x = t
 			} else {
 				return errors.New(fmt.Sprintf("unsupported time format %v", string(data)))
 			}